The correct answer is option 1: Guru Angad. Guru Angad succeeded Guru Nanak as the second Guru of Sikhs. After the death of Guru Nanak in 1539, Guru Angad was chosen by Guru Nanak himself as his successor, following the concept of Guruship in Sikhism. Guru Angad played a significant role in spreading and consolidating the teachings of Guru Nanak. He further developed the Gurmukhi script, which is still used for writing Punjabi. Guru Angad also encouraged the practice of langar (community kitchen) and worked towards enhancing women`s status in society. Under his guidance, Sikhism continued to flourish and gain more followers. Guru Angad served as the Guru for 13 years before passing on the Guruship to Guru Amar Das.